On Thu, Oct 13, 2016 at 11:38:46PM +0100, Edd Barrett wrote:
> Hey,
> 
> As we saw earlier on misc@, getting a vmm host on the internet when the
> host is using a wireless interface is not as straightforward as with
> wired interfaces.
> 
> Specifically, a bridge won't work on a wireless interface, which in turn (I
> think) means virtual switches don't work either (although I did not try
> that).
> 
> Some mentioned that it's possible to use a nat with a vether bridge.
> 
> Striving for a simpler working setup, after some thinking, and a
> discussion with mlarkin@, I decided to find out:
> 
>  1) If you really need the vether interface in the equation.
>  2) If you could use dhcpd on the tap interface of a vm.
> 
> Mike asked me to write to tech@ reporting the outcome of 2.

... snip ...

> When I ran dhclient in the guest this time:
> 
> ---8<---
> # dhclient vio0           
> DHCPDISCOVER on vio0 - interval 3
> panic: kernel diagnostic assertion "m != NULL" failed: file 
> "../../../../dev/pci/if_vio.c", line 1008
> Stopped at      Debugger+0x9:   leave
>    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
> *45447  45447     77    0x100013          0    0  dhclient
> Debugger() at Debugger+0x9
> panic() at panic+0xfe
> __assert() at __assert+0x25
> vio_rxeof() at vio_rxeof+0x1db
> vio_rx_intr() at vio_rx_intr+0x28
> virtio_check_vqs() at virtio_check_vqs+0x8c
> virtio_pci_legacy_intr() at virtio_pci_legacy_intr+0x6b
> intr_handler() at intr_handler+0x28
> Xintr_legacy7() at Xintr_legacy7+0xdd
> --- interrupt ---
> Xspllower() at Xspllower+0xc
> if_enqueue() at if_enqueue+0x69
> ether_output() at ether_output+0x1b0
> bpfwrite() at bpfwrite+0x153
> spec_write() at spec_write+0xb5
> end trace frame: 0xffff80000e3a8c60, count: 0
> http://www.openbsd.org/ddb.html describes the minimum info required in bug
> reports.  Insufficient info makes it difficult to find and fix bugs.
> --->8---

I know about this panic, it's on my list of things to fix, but I haven't
got around to investigating. My gut tells me this is a membar issue because
it's trying to reuse an already-used descriptor. But I could be wrong.

-ml

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